Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. The sample...
27 KB (3,875 words) - 17:51, 20 July 2024
Random-sampling mechanism Resampling (statistics) Pseudo-random number sampling Sample size determination Sampling (case studies) Sampling bias Sampling distribution...
54 KB (7,394 words) - 10:34, 24 August 2024
Since the sample error can often be estimated beforehand as a function of the sample size, various methods of sample size determination are used to...
5 KB (698 words) - 18:44, 20 October 2023
subgroups' sample sizes proportional to the amount of data available from the subgroups, rather than scaling sample sizes to subgroup sizes (or to their...
11 KB (1,512 words) - 15:03, 23 August 2024
{\displaystyle c_{\rm {v}}\,} itself. For many practical purposes (such as sample size determination and calculation of confidence intervals) it is s l n {\displaystyle...
30 KB (4,015 words) - 16:59, 17 May 2024
statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that...
53 KB (7,378 words) - 06:26, 20 August 2024
Student's t-test (redirect from Two-sample t-test)
x ¯ {\displaystyle {\bar {x}}} is the sample mean, s is the sample standard deviation and n is the sample size. The degrees of freedom used in this test...
50 KB (6,785 words) - 19:18, 25 August 2024
Standard error (section Independent and identically distributed random variables with random sample size)
the sampling mean distribution obtained is equal to the variance of the population divided by the sample size. This is because as the sample size increases...
20 KB (2,691 words) - 17:40, 10 June 2024
Variance (redirect from Sample variance)
a sample is taken without knowing, in advance, how many observations will be acceptable according to some criterion. In such cases, the sample size N...
58 KB (10,078 words) - 09:09, 23 August 2024
Bootstrapping (statistics) (redirect from Bootstrap sample)
a computer, sampling from it to form a new sample (called a 'resample' or bootstrap sample) that is also of size N. The bootstrap sample is taken from...
68 KB (9,291 words) - 10:08, 24 August 2024
Stratified randomization (category Sampling (statistics))
population. Sampling Simple random sampling Stratified sampling Stratification(clinical trials) Quota sampling Sample size determination Sampling error Nickolas...
18 KB (2,198 words) - 02:05, 13 July 2024
distributed population). Like most statistical significance tests, if the sample size is sufficiently large this test may detect even trivial departures from...
7 KB (874 words) - 06:11, 12 April 2024
Standard deviation (redirect from Sample standard deviation)
square root of the sample size, and is estimated by using the sample standard deviation divided by the square root of the sample size. For example, a poll's...
55 KB (7,605 words) - 05:25, 26 August 2024
number of interviews and costs given the desired accuracy. For a fixed sample size, the expected random error is smaller when most of the variation in the...
16 KB (2,327 words) - 15:10, 21 August 2024
univariate sample of quantitative data. It can also refer to the population parameter that is estimated by the MAD calculated from a sample. For a univariate...
8 KB (1,095 words) - 07:29, 25 April 2024
Median (redirect from Sample median)
n {\displaystyle n} is the sample size: Sample median ∼ N ( μ = m , σ 2 = 1 4 n f ( m ) 2 ) {\displaystyle {\text{Sample median}}\sim {\mathcal {N}}\left(\mu...
61 KB (7,808 words) - 03:42, 17 August 2024
chance of selection). The ratio of the size of this statistical sample to the size of the population is called a sampling fraction. It is then possible to estimate...
7 KB (836 words) - 01:08, 15 January 2024
may be two columns of a given data set of observations, often called a sample, or two components of a multivariate random variable with a known distribution...
6 KB (665 words) - 21:58, 26 March 2024
given sample size. The sampling distribution depends on the underlying distribution of the population, the statistic being considered, the sampling procedure...
7 KB (729 words) - 14:36, 17 May 2024
Moment (mathematics) (redirect from Sample moment)
expected value of the raw sample moment is equal to the k-th raw moment of the population, if that moment exists, for any sample size n. It is thus an unbiased...
21 KB (3,066 words) - 15:00, 17 June 2024
the mean square error (MSE) of the regression. The denominator is the sample size reduced by the number of model parameters estimated from the same data...
36 KB (5,082 words) - 16:40, 25 August 2024
variability, and sample size), and the effect size of interest. High statistical power is related to low variability, large sample sizes, large effects...
31 KB (4,885 words) - 18:15, 20 July 2024
Pearson correlation coefficient (section Sample size)
{y}})^{2}}}}}} where n {\displaystyle n} is sample size x i , y i {\displaystyle x_{i},y_{i}} are the individual sample points indexed with i x ¯ = 1 n ∑ i =...
58 KB (8,424 words) - 06:55, 24 August 2024
hypothesis test used in the analysis of contingency tables when the sample sizes are large. In simpler terms, this test is primarily used to examine whether...
22 KB (2,399 words) - 13:31, 7 August 2024
ranges that covers nearly all the sizes present in the sample. Some methods of determination allow much narrower size ranges to be defined than can be...
23 KB (3,290 words) - 09:50, 5 July 2023
Order statistic (section A small-sample-size example)
that four numbers are observed or recorded, resulting in a sample of size 4. If the sample values are 6, 9, 3, 7, the order statistics would be denoted...
25 KB (4,485 words) - 00:21, 19 July 2024
Range (statistics) (redirect from Sample range)
probability mass function g(x) the range of the Xi is the range of a sample of size n from a population with distribution function G(x). We can assume without...
9 KB (1,234 words) - 09:29, 3 July 2024
Cross-validation (statistics) (redirect from Out-of-sample testing)
Cross-validation, sometimes called rotation estimation or out-of-sample testing, is any of various similar model validation techniques for assessing how...
42 KB (5,623 words) - 18:40, 25 June 2024
Cramér's V is equal to the absolute value of Phi coefficient. Let a sample of size n of the simultaneously distributed variables A {\displaystyle A} and...
7 KB (984 words) - 20:47, 28 March 2024